1
|
Ait Atmane S, Batır MB, Özbek ZA, Ergönül PG, Balcan E, Ait Eldjoudi D, Özkale E, Bribi N, Khettal B. Cold pressed Pinus halepensis Mill. seed oil for potential health applications: Analgesic, anti-inflammatory effects, and assessment of inflammatory mediators by RT-qPCR in skin wound healing. JOURNAL OF ETHNOPHARMACOLOGY 2024; 319:117157. [PMID: 37696441 DOI: 10.1016/j.jep.2023.117157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/28/2023] [Accepted: 09/07/2023] [Indexed: 09/13/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Pinus halepensis Mill. seed (Pinaceae), commonly known as "Zgougou," is widely consumed in the Mediterranean region and has long been used to treat diseases including bronchitis, rheumatism, infection, and inflammation. AIM OF THE STUDY The present study was focused on the investigation of some pharmacological activities, such as analgesic, anti-inflammatory, and wound healing effects, of cold-pressed oil of Pinus halepensis Mill. seed (COPHS). MATERIALS AND METHODS The fixed oil of Pinus halepensis seed was extracted by a cold pressing process. The analgesic activity of COPHS was examined by acetic acid and formalin-induced contortion and pain tests. The anti-inflammatory effects were evaluated in carrageenan and formalin induced paw and ear edema models. Wound healing potential was assessed on an experimental skin wound, and the expression levels of inflammation mediators were determined by RT-qPCR in skin wound healing. RESULTS The results showed analgesic efficacy through significant inhibition of abdominal cramps (59.15%) and pain (75.91%). In addition, this oil exerted an anti-inflammatory effect by inhibiting ear (62.25%) and paw (70.00%) edema. The COPHS stimulated wound contraction in experimental skin wound healing with a contraction rate of 89.23% with notable reduction of TNF-α and NF-kB expression levels in the treated groups. CONCLUSIONS This study provided for the first time the pharmacological profile, particularly the analgesic, anti-inflammatory, and healing effects, of fixed oil extracted by cold pressing from the seed of Pinus halepensis Mill.
Collapse
Affiliation(s)
- Sihem Ait Atmane
- Laboratory of Plant Biotechnology and Ethnobotany, Faculty of Natural and Life Sciences, University of Bejaia, 06000, Algeria.
| | - Muhammet Burak Batır
- Department of Biology, Faculty of Sciences and Arts, Manisa Celal Bayar University, Manisa, 45140, Turkey
| | - Zeynep Aksoylu Özbek
- Department of Food Engineering, Faculty of Engineering, Manisa Celal Bayar University, Manisa, 45140, Turkey; Department of Food Science, University of Massachusetts Amherst, Amherst, MA, 01003, USA
| | - Pelin Günç Ergönül
- Department of Food Engineering, Faculty of Engineering, Manisa Celal Bayar University, Manisa, 45140, Turkey
| | - Erdal Balcan
- Department of Biology, Faculty of Sciences and Arts, Manisa Celal Bayar University, Manisa, 45140, Turkey
| | - Djedjiga Ait Eldjoudi
- Laboratory of Plant Biotechnology and Ethnobotany, Faculty of Natural and Life Sciences, University of Bejaia, 06000, Algeria
| | - Evrim Özkale
- Department of Biology, Faculty of Sciences and Arts, Manisa Celal Bayar University, Manisa, 45140, Turkey
| | - Noureddine Bribi
- Laboratory of Plant Biotechnology and Ethnobotany, Faculty of Natural and Life Sciences, University of Bejaia, 06000, Algeria
| | - Bachra Khettal
- Laboratory of Plant Biotechnology and Ethnobotany, Faculty of Natural and Life Sciences, University of Bejaia, 06000, Algeria
| |
Collapse
|
2
|
Ait Atmane S, Ait Eldjoudi D, Aksoylu Özbek Z, Günç Ergönül P, Khettal B. Acute and 28-day repeated dose toxicity evaluations of cold pressed Pinus halepensis Mill. seed oil in mice and rats. Regul Toxicol Pharmacol 2022; 132:105191. [DOI: 10.1016/j.yrtph.2022.105191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 05/06/2022] [Accepted: 05/18/2022] [Indexed: 01/18/2023]
|
3
|
SAMEH CHERIF, HANENE GHAZGHAZI, OLFA EZZINE, SALIMA BAHRI, KHOUJA MOHAMEDL, ZOUHAIER NASR, GRACA MIGUELM. Influence of the drought on antioxidant and enzymatic activities of two Pinus species in humid and sub-humid climate. AN ACAD BRAS CIENC 2022; 94:e20200671. [DOI: 10.1590/0001-3765202220200671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 08/13/2020] [Indexed: 11/22/2022] Open
|
4
|
Antidiabetic effects of water-soluble Korean pine nut protein on type 2 diabetic mice. Biomed Pharmacother 2019; 117:108989. [DOI: 10.1016/j.biopha.2019.108989] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/28/2019] [Accepted: 05/13/2019] [Indexed: 01/03/2023] Open
|
5
|
Kuroki T, Lee S, Hirohama M, Taku T, Kumakura M, Haruyama T, Nagata K, Kawaguchi A. Inhibition of Influenza Virus Infection by Lentinus edodes Mycelia Extract Through Its Direct Action and Immunopotentiating Activity. Front Microbiol 2018; 9:1164. [PMID: 29910790 PMCID: PMC5992414 DOI: 10.3389/fmicb.2018.01164] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 05/14/2018] [Indexed: 01/01/2023] Open
Abstract
Lentinula edodes mycelia (LEM) solid culture extracts contain many bioactive compounds with diverse pharmacological activities such as antitumor, antiviral, and immunopotentiating effects. In this study, we examined the anti-influenza virus activity of LEM in vitro and in vivo. LEM directly inhibited influenza virus growth in vitro at early phases of infection, possibly at the entry process of viral particles to host cells. We also found that the nasal administration of LEM increased the survival rate of infected mice, and this was likely due to the direct action of LEM on the viral growth. The oral administration of LEM showed prolonged median survival time of infected mice. Histological analysis revealed that the moderate bronchiolitis was observed in infected mice by the oral administration with LEM, and the extent of alveolitis was dramatically reduced. The orally LEM-administered mice showed a rapid activation of IFN-β gene expression upon influenza virus infection. These results suggest that the immunopotentiation activity of LEM on type I IFN pathway represses the virus spread to distal alveolar regions from peribronchiolar regions which are primary infection sites in the mouse model. We propose that LEM has anti-influenza virus activities through the direct action on viral growth and stimulatory activity of innate immunity.
Collapse
Affiliation(s)
- Takahiro Kuroki
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
| | - Sangjoon Lee
- Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Tsukuba, Japan
| | - Mikako Hirohama
- Department of Infection Biology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tomohiro Taku
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
| | - Michiko Kumakura
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
| | - Takahiro Haruyama
- Department of Infection Biology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Kyosuke Nagata
- Department of Infection Biology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Atsushi Kawaguchi
- Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.,Ph.D. Program in Human Biology, School of Integrative and Global Majors, University of Tsukuba, Tsukuba, Japan.,Department of Infection Biology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| |
Collapse
|
6
|
Bouzenna H, Hfaiedh N, Bouaziz M, Giroux-Metges MA, Elfeki A, Talarmin H. Cytoprotective effects of essential oil of Pinus halepensis L. against aspirin-induced toxicity in IEC-6 cells. Arch Physiol Biochem 2017; 123:364-370. [PMID: 28719240 DOI: 10.1080/13813455.2017.1347689] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
CONTEXT Essential oils from Pinus species have been reported to have various therapeutic properties. OBJECTIVE This study was undertaken to identify the chemical composition and cytoprotective effects of the essential oil of Pinus halepensis L. against aspirin-induced damage in cells in vitro. MATERIAL AND METHODS The cytoprotection of the oil against toxicity of aspirin on the small intestine epithelial cells IEC-6 was tested. RESULTS The obtained results have shown that 35 different compounds were identified. Aspirin induced a decrease in cell viability, and exhibited significant damage to their morphology and an increase in superoxide dismutase (SOD) and catalase (CAT) activities. However, the co-treatment of aspirin with the essential oil of Pinus induced a significant increase in cell viability and a decrease in SOD and CAT activities. CONCLUSION Overall, these finding suggest that the essential oil of Pinus halepensis L. has potent cytoprotective effect against aspirin-induced toxicity in IEC-6 cells.
Collapse
Affiliation(s)
- Hafsia Bouzenna
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | - Najla Hfaiedh
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
- c Laboratory Animal Eco Physiology , Faculty of Sciences of Gafsa , Gafsa , Tunisia
| | | | - Marie-Agnès Giroux-Metges
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
| | - Abdelfattah Elfeki
- b Laboratory of Environmental Physiopathology, Valorization of Bioactive Molecules and Mathematical Modeling , Faculty of Sciences Sfax , Gafsa , Tunisia
| | - Hélène Talarmin
- a Laboratory ORPHY EA4324, UFR Sciences et Technique , Université de Bretagne Occidentale 6 Avenue Le gorgeu , Brest , France
| |
Collapse
|
7
|
Zhang H, Zhao H, Zhou X, Yang X, Shen S, Wang J, Wang Z, Geng L. Isolation and characterization of antioxidant polysaccharides (PKCP-D70-2-a and PKCP-D70-2-b) from the Pinus koraiensis pinecone. RSC Adv 2016. [DOI: 10.1039/c6ra23205a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Water-soluble polysaccharides from Pinus koraiensis pinecone was fractionated using DEAE cellulose-52 and Sephadex G-100 successively to obtain two eluents named PKCP-D70-2-a and PKCP-D70-2-b.
Collapse
Affiliation(s)
- Hua Zhang
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Haitian Zhao
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Xintao Zhou
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Xin Yang
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Siyan Shen
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Jing Wang
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Zhenyu Wang
- Department of Food Science and Engineering
- School of Chemistry and Chemical Engineering
- Harbin Institute of Technology
- Harbin
- China
| | - Lin Geng
- School of Materials Science and Engineering
- Harbin Institute of Technology
- Harbin
- China
| |
Collapse
|
8
|
Some physicochemical characteristics of pinus (Pinus halepensis Mill., Pinus pinea L., Pinus pinaster and Pinus canariensis) seeds from North Algeria, their lipid profiles and volatile contents. Food Chem 2015; 188:184-92. [DOI: 10.1016/j.foodchem.2015.04.138] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2013] [Revised: 04/28/2015] [Accepted: 04/30/2015] [Indexed: 11/19/2022]
|
9
|
Chung HS, Lee JH. Comparative Evaluation of Physicochemical Properties of Pine Needle Powders Prepared by Different Drying Methods. Prev Nutr Food Sci 2015; 20:143-7. [PMID: 26176003 PMCID: PMC4500518 DOI: 10.3746/pnf.2015.20.2.143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/08/2015] [Indexed: 11/06/2022] Open
Abstract
Systematic study of how different drying methods, namely hot-air drying, vacuum-drying, and freeze-drying, affect color, browning index, degree of rehydration, water solubility, and vitamin C content is critical for utilizing pine needle powders (PNP) as a novel ingredient in functional foods. Samples prepared by vacuum-drying showed a significantly higher L*-value, whereas higher a*- and b*-values were detected in the hot-air dried samples (P<0.05). The browning index was significantly higher in samples prepared by vacuum-drying compared to samples prepared by freeze-drying (P<0.05). Freeze-dried PNP exhibited a significantly higher degree of rehydration than hot-air dried samples (P<0.05). Water solubilities of freeze-dried and hot-air dried samples were significantly higher than that of vacuum-dried sample (P<0.05). Vitamin C was less destroyed during freeze-drying compared to hot-air or vacuum-drying (P<0.05). Freeze-dried samples displayed a clear porous structure and appeared to have a bigger space, whereas hot-air dried samples showed lower porosity than vacuum and freeze-dried samples.
Collapse
Affiliation(s)
- Ha-Sook Chung
- Department of Food and Nutrition, Duksung Women's University, Seoul 132-714, Korea
| | - Jun Ho Lee
- Department of Food Science and Engineering, Daegu University, Gyeongbuk 712-714, Korea
| |
Collapse
|
10
|
Lee JH. Physicochemical and Sensory Evaluation of Whole Soybean Curd Supplemented with Pine Needle Powder. Prev Nutr Food Sci 2015; 20:148-52. [PMID: 26176004 PMCID: PMC4500519 DOI: 10.3746/pnf.2015.20.2.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 06/08/2015] [Indexed: 11/06/2022] Open
Abstract
To develop functionally and nutritionally improved whole soybean curd (WSC), the effects of partial (0 ~ 4%) replacement with pine needle powder (PNP) on the quality characteristics of WSC were investigated. The moisture content and pH ranged from 76.96~77.80% (wet basis) and 6.69~6.74, respectively, with no considerable differences. Lightness significantly decreased with higher PNP content in the formulation (P<0.05), as indicated by visual observation that the color of WSC became darker. Redness and yellowness also significantly decreased (P<0.05). The texture profile analysis indicated that WSC containing PNP was softer and less cohesive than control WSC. 2,2-Diphenyl-1-picrylhydrazyl and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) radical scavenging activities significantly increased (P<0.05) with higher substitution of PNP, and they were well correlated. Results from the consumer test revealed that WSC with 1% PLP received the most favorable acceptance scores for sensory attributes, including overall acceptability. The present study indicated that the characteristics of PNP may play a role in improving WSC quality in terms of physicochemical, sensorial, and antioxidant characteristics.
Collapse
Affiliation(s)
- Jun Ho Lee
- Department of Food Science and Engineering, Daegu University, Gyeongbuk 712-714, Korea
| |
Collapse
|
11
|
Chemical composition and antioxidant activity of essential oil of six pinus taxa native to China. Molecules 2015; 20:9380-92. [PMID: 26007189 PMCID: PMC6272626 DOI: 10.3390/molecules20059380] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 05/19/2015] [Indexed: 12/11/2022] Open
Abstract
The essential oils obtained by steam distillation from needles of six China endemic Pinus taxa (P. tabulaeformis, P. tabulaeformis f. shekanensis, P. tabulaeformis var. mukdensis, P. tabulaeformis var. umbraculifera, P. henryi and P. massoniana) were analysed by GC/MS. A total of 72 components were separated and identified by GC/MS from the six taxa. The major constituents of the essential oils were: α-pinene (6.78%–20.55%), bornyl acetale (3.32%–12.71%), β-caryophellene (18.26%–26.31%), α-guaiene (1.23%–8.19%), and germacrene D (1.26%–9.93%). Moreover, the essential oils were evaluated for antioxidant potential by three assays (DPPH, FRAP and ABTS) and tested for their total phenolic content. The results showed that all essential oils exhibited acceptable antioxidant activities and these strongly suggest that these pine needles may serve as a potential source of natural antioxidants for food and medical purposes.
Collapse
|
12
|
|
13
|
Dhibi M, Mechri B, Brahmi F, Skhiri F, Alsaif MA, Hammami M. Fatty acid profiles, antioxidant compounds and antiradical properties of Pinus halepensis Mill. cones and seeds. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2012; 92:1702-1708. [PMID: 22228540 DOI: 10.1002/jsfa.5535] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 10/27/2011] [Accepted: 11/04/2011] [Indexed: 05/31/2023]
Abstract
BACKGROUND Pinus halepensis (Aleppo pine) is a widespread tree that can be found in both natural and urban environments. A discrimination study based on the antioxidant compounds, antioxidant capacity and fatty acid (FA) profile of P. halepensis cones (PHC) and seeds (PHS) was performed. RESULTS The total amount of phenols was about 72-fold higher in PHC extract than in PHS extract (P < 0.001). Anthocyanin and carotenoid contents were 10- and 12-fold higher respectively in PHC extract. PHC and PHS extracts at a concentration of 1 mg mL(-1) differed significantly in free radical-scavenging activity on 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(•)) (86.65 vs 16.97%). PHC had higher antioxidant ability on 2,2'-azino-bis(3-ethylbenzothialozine-6-sulfonic acid) radical cation (ABTS(•+)) than PHS (EC(50) 0.368 vs 2.345 mg mL(-1)). The FA profile of PHC oil revealed its richness in saturated FAs (41.5%) and high levels of trans FA isomers, with a predominance of trans,trans-linoleic acid (4.74%). However, polyunsaturated FAs in PHS oil represented more than 64% of total FAs. CONCLUSION PHC showed important antioxidant activities as well as high levels of bioactive compounds. Thus PHC is a potential source of natural antioxidants that may afford several health benefits. However, the lipid extract of PHS seems to have more nutritional value as a polyunsaturated oil than that of PHC, which is high in saturated and trans FAs.
Collapse
Affiliation(s)
- Madiha Dhibi
- Laboratory of Biochemistry, UR Human Nutrition and Metabolic Disorders, Faculty of Medicine, University of Monastir, 5019 Monastir, Tunisia
| | | | | | | | | | | |
Collapse
|
14
|
Momose F, Basler CF, O'Neill RE, Iwamatsu A, Palese P, Nagata K. Cellular splicing factor RAF-2p48/NPI-5/BAT1/UAP56 interacts with the influenza virus nucleoprotein and enhances viral RNA synthesis. J Virol 2001; 75:1899-908. [PMID: 11160689 PMCID: PMC115136 DOI: 10.1128/jvi.75.4.1899-1908.2001] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Previous biochemical data identified a host cell fraction, designated RAF-2, which stimulated influenza virus RNA synthesis. A 48-kDa polypeptide (RAF-2p48), a cellular splicing factor belonging to the DEAD-box family of RNA-dependent ATPases previously designated BAT1 (also UAP56), has now been identified as essential for RAF-2 stimulatory activity. Additionally, RAF-2p48 was independently identified as an influenza virus nucleoprotein (NP)-interacting protein, NPI-5, in a yeast two-hybrid screen of a mammalian cDNA library. In vitro, RAF-2p48 interacted with free NP but not with NP bound to RNA, and the RAF-2p48-NP complex was dissociated following addition of free RNA. Furthermore, RAF-2p48 facilitated formation of the NP-RNA complexes that likely serve as templates for the viral RNA polymerase. RAF-2p48 was shown, in both in vitro binding assays and the yeast two-hybrid system, to bind to the amino-terminal region of NP, a domain essential for RNA binding. Together, these observations suggest that RAF-2p48 facilitates NP-RNA interaction, thus leading to enhanced influenza virus RNA synthesis.
Collapse
Affiliation(s)
- F Momose
- Laboratory of Molecular Medical Engineering, Department of Biological Information, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, Midori-ku, Yokohama 226-8501, Japan
| | | | | | | | | | | |
Collapse
|
15
|
Meanwell NA, Krystal M. Taking aim at a moving target — inhibitors of influenza virus Part 2: viral replication, packaging and release. Drug Discov Today 1996. [DOI: 10.1016/1359-6446(96)10035-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
16
|
Watanabe K, Handa H, Mizumoto K, Nagata K. Mechanism for inhibition of influenza virus RNA polymerase activity by matrix protein. J Virol 1996; 70:241-7. [PMID: 8523532 PMCID: PMC189810 DOI: 10.1128/jvi.70.1.241-247.1996] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Influenza virus M1 protein has been shown to inhibit the transcription catalyzed by viral ribonucleoprotein complexes isolated from virions. Here, this inhibition mechanism was studied with the recombinant M1 protein purified from Escherichia coli expressing it from cDNA. RNA mobility shift assays indicated that both soluble and aggregate forms of the recombinant M1, which were separated by the glycerol density gradient, were bound to RNA. Once an M1-RNA complex was formed, free M1 was bound to the M1-RNA complex cooperatively rather than to free RNA. In addition, the recombinant M1 was capable of binding to preformed RNA-nucleocapsid protein complexes. The mechanism for inhibition of the viral RNA polymerase activity was analyzed by the in vitro RNA synthesis systems that depend on an exogenously added RNA template. These systems were more sensitive for evaluating the inhibition by M1 than the RNA synthesis system depending on an endogenous RNA template. The RNA synthesis inhibition was examined at four steps: cleavage of capped RNA; incorporation of the first nucleotide, GMP; limited elongation; and synthesis of full-size product. M1 inhibited RNA synthesis mainly at the early steps. The experiments with M1 mutant proteins containing amino acid deletions suggested that the M1 region between amino acid residues 91 and 111 was essential for anti-RNA synthesis activity, RNA binding, and oligomerization of M1 on RNA.
Collapse
Affiliation(s)
- K Watanabe
- Tokyo Institute of Technology, Yokohama, Japan
| | | | | | | |
Collapse
|